What should I replace when installing a new transmission?

Buddylee · Feb 29, 2024

I’m debating having a new transmission installed because of some small issues I’m having with my current one. It has slipped a couple of times in OD when the weather is really hot and I ‘m having some weird shifting issues. This is the original transmission with 240 thousand miles on it. There is also a lot of slack in my drivetrain. I’ve already had the rear end rebuilt and ujoint’s replaced so not much else it could be. I was thinking about throwing in a new rear main seal and maybe a new flex plate because this is my daily driver that I plan to keep for many years. Anything else I should do while I’m at it?

chasw1969 · Feb 29, 2024

Engine and transmission mounts. If you are doing yourself make sure to flush the lines including the cooler. Also change torque converter.

Bobthebiker · Feb 29, 2024

+1 on these items. absolutely good ideas to do. NEVER would i reuse an old torque converter. They trap too much stuff, and it can be a big hassle. Not something I'd like to fiddle with in a daily.

It's a great time to do the turbo up pipes too, get a set of bellowed ones, they're easy to do with the transmission out for sure, loads more space to work on the thing up in there.

chasw1969 · Mar 1, 2024

Agreed, apologies for missing

Bobthebiker · Mar 1, 2024

No worries, I only thought about it because I need to do mine at some point soon.

Buddylee · Mar 2, 2024

Thanks for the replies everyone, I will add those items to the list.

Daniel Goetschius · Jun 11, 2025

I just bought a 2003 f350 7.3 power stroker reverse is gone so tonight I just bought a BD tranny with new torque converter the motor is solid but it’s got a lot of hwy miles what all should I do aside from things discussed I’m a die hard diesel fan but need some schooling

What should I replace when installing a new transmission?

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